摘要
针对试验系统夹气所产生的破坏,需要研究试验系统夹气对离心泵性能测量的影响,分别从扬程、效率、功率及汽蚀余量公式对离心泵性能的影响因素进行研究,根据理论公式和试验系统夹气带来的密度、流量等变化分析了夹气对离心泵测量性能的影响。在试验系统夹气情况下对流量计位于泵和调节阀之间与泵出口调节阀之后的影响进行了分析。试验结果表明,试验系统夹气会造成测量的离心泵扬程(用压力表示的扬程)和效率提高、功率降低、汽蚀余量增大;流量计位于离心泵和调节阀之间,试验系统夹气时,测量的扬程(用压力表示的扬程)、效率和功率都接近未夹气时的结果;流量计位于调节阀之后,试验系统夹气时测量的离心泵扬程(用压力表示的扬程)和效率都高于未夹气时的结果,功率降低。由于流量计位置对测量的影响,在设计试验系统时尽可能把流量计设置在离心泵与调节阀之间。
Since there is a damage caused by gas entrapment of test system,it is necessary to study the influence of gas entrapment of the test system on the centrifugal pump performance measurement.The influence factors of the theoretical formula of delivery head,efficiency,power and NPSH on the performance of centrifugal pump were analyzed in this paper.According to the theoretical formula and density and flow rate changes caused by gas entrapment of the test system,the influences of gas entrapment on the measurement of centrifugal pump performance were analyzed.In the case of gas entrapment of the test system,the measured different results were analyzed when the flow meter is located between the pump and regulating valve or after regulating valve at pump outlet.The results show that the gas entrapment of the test system may result in increase of delivery head,efficiency and NPSH,but decrease of centrifugal pump power.The results measured while executing gas entrapment are close to the results before executing gas entrapment when flow meter is located between the centrifugal pump and the regulating valve.When flow meter is located after the regulating valve,the results measured of delivery head,efficiency are higher than those before executing gas entrapment.Because of the influence of the flow meter position on measuring result,flow meter should be located between centrifugal pump and regulating valve so far as possible in design of the test system.
作者
刘成胜
王晓锋
赵艳丽
张凯
LIU Chengsheng;WANG Xiaofeng;ZHAO Yanli;ZHANG Kai(Xi’an Aerospace Propulsion Institute, Xi’an 710100, China)
出处
《火箭推进》
CAS
2018年第6期75-80,共6页
Journal of Rocket Propulsion
基金
国家重大基础研究项目(61321)
关键词
试验系统
夹气
性能测量
扬程
test system
gas entrapment
performance measurement
delivery head
